Hi Robert,
To enable automatic generation of KdTree's I have extended osgDB so
that the Registry and DatabasePager are both KdTree aware, and if
KdTree build option is enabled it'll use the Registry's new
KdTreeBuilder object to build KdTree's on loaded models. To enable
this building you simple set the env var OSG_BUILD_KDTREES to on, i.e.
set OSG_BUILD_KDTREES=on
osgpick cow.osg
Or programatically you can enable building of KdTrees via:
osgDB::Registry::instance()->setBuildKdTreesHint(osgDB::ReaderWriter::Options::BUILD_KDTREES);
You'll need to call this before you load any models that you wish to
have BUILD_KDTREES set.
This is all good, but do we need to do anything to get the kd-tree
rebuilt if some geometry changes? Or is this all transparently handled
by osg::Geometry::dirty() / dirtyDisplayList()?
In my Masters project one of the goals was to support totally dynamic
geometry, so any object could both be moved (dynamic with respect to
transform nodes) or deformed (dynamic with respect to actual geometry).
So it was possible to modify vertices in the osg::Geometry's vertex
array. But then, if there is a kd-tree for that geometry, it needs to be
rebuilt...
Thanks,
J-S
--
______________________________________________________
Jean-Sebastien Guay [EMAIL PROTECTED]
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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